Janesville is a city in Rock County, Wisconsin, United States, and its county seat. As of the 2020 census, the city had a population of 65,6…Janesville is a city in Rock County, Wisconsin, United States, and its county seat. As of the 2020 census, the city had a population of 65,615, making it the tenth-most populous city in Wisconsin. It is a principal municipality of the Janesville–Beloit metropolitan statistical area, which consists of all of Rock County and is included in the greater Madison–Janesville–Beloit combined statistical area.
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